Doepfer

I managed to get an A-126, but it seems to be broken. The only knob that does something is the level knob, and I have to turn it up a lot to actually get something out of the outputs. Manual shift, CV and Mix don't do anything at all.

I didn't try the calibration procedure as it doesn't look to be solvable that way, but I can be wrong about that (wouldn't mind to be wrong to be honest :-) ).

Rigo

The A-126 is a very complex module (quadrature VCO, dome filter, two ring
modulators, adders/subtractors) and it's impossible from the distance to
make a diagnosis what is wrong if it's not working at all. Maybe the
quadrature VCO (based on rare CEM3382) is broken. But that's only a guess.
You would have to be very experiences with electronics to repair the module
yourself. E.g. for the dome filter adjustment a very special measuring
equipment is required as you have to measure the phase shift in relation to
the frequency. I fear you will have to send in the module for repair.

Best wishes
Dieter Doepfer

> -----Ursprüngliche Nachricht-----
> Von: Doepfer_a100@yahoogroups.com [mailto:Doepfer_a100@yahoogroups.com]
> Gesendet: Dienstag, 19. Februar 2019 20:12
> An: Doepfer_a100@yahoogroups.com
> Betreff: [Doepfer_a100] Broken A-126
>
>
> I managed to get an A-126, but it seems to be broken.  The only
> knob that does something is the level knob, and I have to turn it
> up a lot to actually get something out of the outputs.  Manual
> shift, CV and Mix don't do anything at all.
> I didn't try the calibration procedure as it doesn't look to be
> solvable that way, but I can be wrong about that (wouldn't mind
> to be wrong to be honest :-) ).
>
>
> Rigo

Yes, this should work. You may also try the CEM3382 from the A-126 in the
A-131 to make a crosscheck.

Good luck
Dieter Doepfer

> -----Ursprüngliche Nachricht-----
> Von: Doepfer_a100@yahoogroups.com [mailto:Doepfer_a100@yahoogroups.com]
> Gesendet: Mittwoch, 20. Februar 2019 16:24
> An: Doepfer_a100@yahoogroups.com
> Betreff: [Doepfer_a100] Re: Broken A-126
>
>
> Can I try to replace the CEM3382 with the PA382 from an old
> A-131, just as a test ?
> I got the A-126 together with an A-143-9, so when sending in is
> needed they will both come